After going through the guide at https://hub.meltano.com/extractors/tap-netsuite/ I found that when running the command meltano select tap-netsuite --list --all I would only get the fields defined in tap-netsuite/netsuite/schemas/object_definition.json

For now I have copied the line as well as the Total from the Sales Order and added to the Invoice object within that file:

{"displayName": "SalesRep", "name": "salesRep", "type": "string"},
{"displayName": "Total", "name": "total", "type": "number"},

What is the best way to add fields that are not defined in the object_definition.json file?